Mac Miller is not taking his breakup from Ariana Grande well.

He was arrested early this morning in California's San Fernando Valley after he slammed his G-Wagon into a power pole and then fled the scene on foot.

An eyewitness to the 1 AM accident told police which way Mac and his two buddies ran. The cops then ran the G-Wagon's plates, found Mac's home address, and showed up at his door. Mac confessed to drinking and driving and was taken in. As of now, he's still locked up on a 15K bond.

"He was the most polite and nice intoxicated person we've ever seen," police said about Miller.

Luckily, he just hit a power pole and not a person.